1. Remove Engine: Disconnect all EZ-Start wires from the EZ-Start motor and the engine. Note: The yellow wire from the wire

harness will be accessible after the engine is lifted from the chassis. If using a TRX 2.5 engine with pull start, remove the

EZ-Start wiring harness from the chassis completely. Disconnect the fuel line from the carburetor and disconnect the pressure

line from the exhaust pipe. Remove the throttle and brake linkage (including the throttle servo horn and brake lever) completely

from the chassis by removing the 3x6RST screw from the throttle servo and loosening the 3x3GS at the top of the brake cam.

Remove the engine and exhaust system from the chassis by removing the four 3x10CS engine mount screws from the bottom

of the chassis and the 3x10CM screw with 3.0NL nut that fastens the pipe hanger to the chassis. Keep the screws, they will be

reused with the new pipe hanger.

2. Transfer Components: Remove the engine mount and the clutch assembly from the TRX Pro.15 engine and reinstall them

not to over tighten. Note: If using the EZ-Start 2 starting system (optional), remove the pull starter from the engine and install

the EZ-Start 2 system onto the engine. Note: On older style fuel tanks, replace the straight pressure fitting on top of the tank

with the 90 degree pressure fitting (included) to clear the EZ-Start 2 starter motor.]

4. Drill Holes for Throttle Bellcrank: Disconnect the shift linkage from the shift fork shaft. Disconnect the rear drive shaft from the

transmission output shaft by removing the 4x5yoke pin. Slide the drive shaft back toward the rear and leave the shaft attached

to the rear differential. Remove the eight 3x12RM screws (located in the chassis braces) that secures the transmission to the

chassis (see diagram). Lift the transmission from the chassis to make room to drill the holes for the throttle bellcrank assembly.

Cut out and place the included throttle bellcrank post template onto the chassis (see diagram for orientation) and mark the

indicated bellcrank post holes onto the chassis. Drill holes into the chassis, where marked, with a 3.0mm (1/8”) drill bit (included).

Make sure that the front differential drive shaft is keyed into the front transmission drive shaft and set the transmission back into

for orientation). Note: The throttle servo reversing switch (CH2) on the transmitter must be switched opposite of the stock

position for proper rotation of the servo output shaft. Turn on the radio system, center the throttle trim, and attach the new

servo horn onto the throttle servo. Note: Mount the servo horn onto the servo so that when the throttle trigger is at neutral,

the carburetor is at the idle position.

6. Installation: Install the engine (with the exhaust system and clutch assembly) onto the chassis leaving the engine mount

screws just loose enough to adjust the gear mesh. Adjust the gear mesh by sliding the clutch bell gear all the way up to the

spur gear and then back off just slightly until the gears spin freely together. Secure the assembly by tightening the four

3x10CS screws. Attach the ball cup from the carburetor link onto the throttle arm of the carburetor. Reattach the fuel and

pressure lines to the carburetor and exhaust pipe (shorten the fuel line from the tank to the carburetor if needed). Note: If using

the EZ-Start 2 system (optional), connect the wiring harness to the appropriate contacts on the EZ-Start motor and engine.

Follow the instructions in the T-Maxx manual for proper shift adjustment.